-√80 how do i do this?

Question

-√80  how do i do this?

anonymous · Answer

I assume you just need to factor it out so the best way to do it is figure out a multiple that's a perfect square and then it's just a multiple of that and the square root of the other number, such as squrt(125) is 5 * squrt(5) since 125 = 5 * 25.

anonymous · Answer

well the instructions say that i need to simplify and that all vaiables need to represent nonnegative numbers...

anonymous · Answer

so how do i take the negative away?

anonymous · Answer

Take out the multiple of sqrt(1) which is the imaginary unit, i as a multiple of your simplified answer, my friend.

anonymous · Answer

im so confused

phi · Answer

If this is 
$$ -\sqrt{80} $$ 
then the best you can do is factor out a perfect square
80 = 16*5  or 4^2 * 5
so you get
$$-\sqrt{16*5} =-4\sqrt{5} $$